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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Common Stock Shares Issued 186,797 201,212 197,638
Shares issued to directors (in shares) 251,323 117,886 172,887
Issuance of partnership units pursuant to dividend reinvestment plan (in shares) 124,758 107,037 196,183
Series A Preferred Stock      
Redemption of preferred stock (in shares)     16,000
Series C Preferred Stock      
Issuance of preferred stock, (in shares)     16,000
Dividend declared      
Distributions payable common stock and partnership units (in usd per share) $ 0.51 $ 0.43 $ 0.4
Dividend declared | Series C Preferred Stock      
Distributions payable on preferred stock (in usd per share) $ 42.97 $ 42.97 $ 42.97